Phonograph record



Patented Feb. 12, 1924.

PATENT OFFICE.

LEONARD SLINGLAN D, 01? IPATERSON, NEW JERSEY.

PHONOGRAPH RECORD.

Application filed August 18, 1922. Serial No. 582,733.

To all whom it may concern:

Be it known that I, LEONARD SLINGLAND, a citizen of the United States, and resident of Paterson, in the county of Passaic and State of New Jersey, have invented a new and Improved Phonograph Record, of which the following is a full, clear, and exact description.

This invention has relation to sound reproducing devices and has particular reference to an improvement in phonograph disc records.

In the present construction of phonograph disc records, considerable difiiculty is experienced in properly placing the needle in the sound reproducing groove and to this end, it is an object of the present invention to provide means for facilitating the proper placement of the needle in order to insure the playing of the music immediately at the start and in order to prevent the scratching or marring of the record.

As a further object the invention contemplates a means for expediting the start of the music when the turntable of the machine has been put in motion and the needle has been engaged with the record.

The invention further contemplates an improvement in phonograph disc records which is extremely simple in its construction, inexpensive to manufacture and which is thoroughly reliable and highly efiicient in its purpose.

With the above recited and other objects in view, the invention resides in the novel construction set forth in the following specification, particularly pointed out in the appended claim and illustrated in the accompanying drawing, it being understood that the right is reserved to embodiments other than those actually illustrated herein to the full extent. indicated by the general meaning of the terms in which the claim is expressed.

In the drawing Figure 1 is a plan view of a record constructed in accordance with the invention.

Fig. 2 is an enlarged detail sectional view therethrough taken approximately on the line indicated at 2--2 of Fig. 1.

Referring to the drawing by characters of reference, 10 designates a disc record which is provided with the usual sound reproducing groove 11 defining between the margin of the record and said grooves a blank space 12. To facilitate the placement and guiding of the needle to the point at which the actual sound waves start, a splral groove 13 is formed, the convolutions of which are arranged at a greater pitch than the convolutions of the sound reproducing groove whereby the needle will be rapidly advanced to the point immediately in advance of the start of the music. If desired. the space 12 may be colored dif-' ferently from the remainder of the record in order to guide the operator in the placement of the needle at the proper point, thus protecting the sound reproducing grooves against scratching or marring. Preferably" the groove 13 is deeper and larger than the sound reproducing-grooves in order that the inner terminal 14 may be directed inwardly to a point immediately in advance of the music to lead the needle to this point rapidly and doing away with the running, of the needle over a large number of convolutions prior to the actual start of the record. The formation of the groove 13 obviates the danger of placing the needle on a blank outer margin which will cause the same to run indefinitely without playing, and which will prevent the slipping of the needle off on to the turntable and scratching the same. It is, of course, understood that where a double-faced record is used the groove will be-provided on the opposite faces thereof.

I claim: V

As a new article of manufacture, a phonograph disc record having'a smooth portion lying between the marginal edge and the sound producing portion and provided with a spiral groove having its outer end adjacent the outer margin of said smooth portion, said groove extending more than one full turn around the record and having its inner end terminating immediately in advance of the sound producing portion of the record, said groove being larger, deeper and having its convolutions of greater pitch than the sound producing grooves, substantially as and for the purpose set forth.

LEONARD SLINGLAND. 

